Which of the Following Would Reduce the Supply of an Athletic

Which of the following would reduce the supply of an athletic trainer's services at today's wage rate, other things constant?

A) a reduction in the individual's income from other sources
B) an improvement in the quality of the work environment
C) an increase in the amount of control the trainer has over the use of time on the job
D) a trainer's future earning possibilities go down due to a new negative image associated with this work
E) an increase in the trainer's preference for this type of work